/**
***********************************************************************
*
* Copyright 2011 Stefan Wöhle
*
* This file is part of PixelMath
*
* PixelMath is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* PixelMath is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with PixelMath. If not, see <http://www.gnu.org/licenses/>.
*
***********************************************************************
*/

#ifndef LOCALIZEDFUNCTION_H
#define LOCALIZEDFUNCTION_H

#include "formula.h"

/*********************************************************
 *
 *  LocalizedFunction
 *
 *  This is the baseclass for all formula elemens which
 *  are depenting on the Formula::sourceImage. The defined
 *  subformulas presents the position in the image. This
 *  is useful for the RGB-values or the average(brightness).
 *
 **********************************************************/

class LocalizedFunction : public Formula
{
    Q_OBJECT
protected:
    Formula *xFormula;
    Formula *yFormula;

public:
    explicit LocalizedFunction(QObject *parent = 0);
    void setX(Formula *x) {xFormula = x;}
    void setY(Formula *y) {yFormula = y;}
    Formula* x(){return xFormula;}
    Formula* y(){return yFormula;}
    virtual double value(int x, int y) = 0; // throws FormulaException
    virtual QString label() = 0;

protected:
    void checkPreconditions(int x, int y); // throws FormulaException
};

#endif // LOCALIZEDFUNCTION_H
